Question

distinguish between metals and non-metals on the basis of
hardness​

Answer 1

Explanation:

Metals are hard while non metals are brittle on the basis of hardness.

Metals are therefore used in making infrastructures etc.

Answer 2

Explanation:

Hardness -

Metals are generally hard. But some metals such as potassium and sodium are soft.

Non metals are soft. But Graphite is an exception.